56 p. T. CLEVE, SYNOPSIS OF THE NAVICDLOID DIATOMS. 



Var. perlonga Pant. (1889). — V. slightly gibbous in the middle. L. 0,4 to 0,5; B. O.oos 

 mm. Strige 10 in 0,oi mm. — Nav. perlonga Pant. IT p. 52; III PI. XIV f. 209. 



Marine: Hungary, fossil (Pant.). 



Var. suhelliptica Cl. — V. linear-elliptical, frequently with subrostrate ends. L. 0,15 to 

 0,19; B. 0,037 to 0,04 mm. Areas broader. Striae 11 to 12 in 0,oi mm. — A. S. Atl. L. 4, 5. 



Marine: Eaised Marsh (Atl.), Redondo and Santa Monica Calif., fossil (Deby'Coll.)! Porto 

 Seguro (Deby Coll.)! 



This large and beautiful form is nearly connected with C. Liber and may be regarded 

 as one of its many varieties. 



20. C. probabilis A. S. (1877). — V. linear with subcuneate ends. L. 0,i6 to O.is; 

 B. 0,0 28 to 0,03 mm. Axial area narrow. Central area small, subrhomboid. Median line slightly 

 flexuose. Strife 10 in 0,oi mm. Longitudinal lines double. — Nav. prob. A. S. Atl. L. f. 46. 



Marine: Campeachy Bay (Atl.), Florida; Java (Grove Coll.)! 

 Also nearly akin to C. liber (var. bicuneata). 



21. C. Eugeniae Cl. (1881). — V. linear, with rounded ends, very convex. L. 0,o75 to 0,o85; 

 B. 0,017 mm. Axial area indistinct. Central area small, rhombic-orbicular. Median line slightly 

 sinuose. Striae 7 to 9 in 0,oi mm., slightly radiate in the middle, somewhat convergent at the 

 ends, not distinctly punctate. Longitudinal lines distinct, submarginal. — Nav. Eug. Cl. N. R. 

 D. p. 7 PI. II f. 16. 



Marino: Galapagos Islands! 



22. C. virginea Cl. (1878). — V. lanceolate with acute or subrostrate and obtuse ends. 

 L. 0,o&8 to 0,09; B. 0,0ii7 to 0,025 mm. Axial area very narrow, slightly dilated unilaterally at 

 the central nodule. Central pores approximate. Strise 20 to 21 in 0,oi mm. parallel. Longi- 

 tudinal lines faint, submarginal. — Nav. virg. Cl. West Ind. D. p. 5 PI. I f. 2. Nav. parallela 

 Castk. Voy. Challenger p. 31 PI. XXVIII f. 12 (1886)? 



Marine: West Indies, Virgin Islands! Bahamas (Grove Coll.)! 



23. C. eximia Grijn. Ms. — V. divided by two deep constrictions into three segments of 

 equal size. L. 0,ii to 0,12; B. 0,025 mm. Axial area narrow. Central area small, orbicular. 

 Strise 14 in 0,oi mm. radiate in the middle. Longitudinal lines double; the exterior stronger — 

 PI. IV f. 2. 



Marine: Seychelles (Van Heurck Coll.)! Cebu (Grove Coll.)! 



24. C. clavigera Cl. N. Sp. — V. elongated, divided by two slight constrictions into one 

 smaller median, and two larger terminal, segments. L- 0,115; B. ,0oi5 (max.) mm. Axial area 

 narrow. Central area a broad fascia. Striae 20 in 0,oi mm., parallel, divergent at the ends. 

 Longitudinal lines median. — PI. IV f. 3. 



Marine: Colon (Deby CoU.)! 



This form may be regarded as a variety of N. Liber, with transverse fascia. 



25. C. (Pleurosigina) staurophora Grun. (1880). — V. sigmoid, lanceolate, gradually 

 tapering from the middle to the acute ends. L. 0,1125; B. 0,oi4 mm. Median line central, 

 sigmoid. Central area a broad, transverse fascia, reaching the] margins. Striae 14 in 0,oi mm. 

 parallel, not punctate. Longitudinal lines closer to the median line than to the margin. Inside the 

 longitudinal lines the striae are fainter than outside. — Pleurosigma staurophorum Grun. A. D. 

 p. 61. Perag. VIII f. 45. 



Marine: Davis Strait (Grun.) 



Var. asiatica Temp. a. Brun (1889) — L. 0,i9 to 0,22; B. 0,025 to 0,o28 mm. Striae 16 to 

 18 in 0,01 mm. — Pleur. asiaticum D. f. du Japon p. 56 PL IX f. 1. Perag. VIII f. 44. 

 Marine: Japan, fossil. 



